Welcome! › Forums › Running Forum › At what age did you notice a significant drop off in race performance? › Re: Re: At what age did you notice a significant drop off in race performance?
As Andrew indicated get the full panel blood test as a first step.
I hit a steep decline from 35-39 but that was in part due to being in grad school and living in the American Outback. After that I rebounded for early masters years but have had plateaus punctuated with injury setbacks. i.e., hold a certain level for a few years, get a major injury an then come back with a little less in the tank.
Most noticeably, at 54 my, range has narrowed somewhat. Sweet spot is the half marathon and I haven't lost much ground–even since early 40s (but only ran one back then) and 5K is my low end. Really struggle with 3K and under, as well as marathon (leads to injuries and other maladies).
In a nutshell, not too far off from age 46-47 to today but I definitely feel shakier. Can't do the workouts (and bounce back in a reasonable time) and weeks on end of 50-70 mile weeks without breaking down.